An epidural steroid injection involves bathing an inflamed nerve root in steroids (potent anti-inflammation medicine) in order to decrease the irritation of the nerve root that is causing pain. Epidural steroid injections are most commonly used in situations of radicular pain, which is a radiating pain that is transmitted away from the spine by an irritated spinal nerve. Irritation of a spinal nerve in the low back (lumbar radiculopathy) causes pain that goes down the leg. Epidural injections also are used to treat nerve compression in the neck (cervical spine), referred to as cervical radiculopathy.
Kenalog in blood - Derby et al. "Size and aggregation of corticosteroids used for epidural injections"
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